In the final hours of a four-state campaign day, President Barack Obama arrives at a rally at Jiffy Lube Live arena, late Saturday night, Nov. 3, 2012, in Bristow, Va. Virginia is one of the most closely contested battleground states. (AP Photo/J. Scott Applewhite)

HARRISBURG, Pa. (AP) — Philadelphia’s heavily populated suburbs will be the focus of attention from Republican presidential nominee Mitt Romney and Pennsylvania’s candidates for U.S. Senate and attorney general just two days before voters pull the lever.

Romney was to visit Shady Brook Farm in Morrisville on Sunday evening. He’ll be with GOP Senate candidate Tom Smith. Also, Democratic U.S. Sen. Bob Casey and the party’s nominee for state attorney general, Kathleen Kane, will make afternoon campaign stops in Bucks and Montgomery counties before attending an evening rally at the University of Pennsylvania in Philadelphia.

Democrats lead the races in independent polls.

Pennsylvania’s key to President Barack Obama’s re-election chances. The traditional battleground state is a top Electoral College prize and no Democrat has won the White House without Pennsylvania in 64 years. Also, Democrats are counting on a Casey victory to maintain control of the chamber.